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I H. W. EVANS.

- Steam Heate r.

Patented June 29, 1869.

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HAMPTON IV. EVANS, OF PHILADELPHIA, PENNSYLVANIA Latte rs Patent'No. 91,834, dated June 29, 1869.

IMPROVEMENT IN STEAM-RADIATORS.

The Schedule referred to in these Letters Patent and making part 01! the same.

-T 0 all whom it may concern 1 IThe nature of my invention consists, in the first place, in the construction of the radiator with zigzag passages for the steam across the longitudinal direction of the latter, whereby an increased outer radiating surface is obtained, and the steam is checked in its course, so as to increase its heating-capacity.

In'the second place, it consists in the construction of the passages in an inclined direction, giving an angular direction to the outside zigzag surfaces of the radiator, so as to arrest the motion of the air as it passes up between them, whereby it becomes more thoroughly heated.

In the third place, the improvement consists in the arrangement of a spring beneath each nut of the bolts which confine the sections of the radiator together, and in combination therewith of an annular plate, beneath the inner end of the spring, and of ahollow cap which covers the nut, and parts beneath the same, the object being to allow of a free expansion and contraction of the confining-bolts, without twisting or warping the sections out of their normal position when a bolt at one end of the radiator expands or contracts unequally withthe one at the other end.

The construction and operation of the radiator will be understood by the following description.

In the accompanying drawings, which make a part of this specification- Figure 1 is a top view of the radiator.

Figure 2 is a side elevation of one of the sections, A.

Figure 3 is a longitudinal section of the radiator, at the line a; a; of fig. 2.

Figure 4 is a longitudinal section of the cap G.

Like letters in all the figures indicate the same parts.

I construct the radiator of one or'more-sections, A, which I usually make in halves and confine .them together by means of rivets or screws, as represented in the drawings.

In the drawings, two of these sections are represented.

In each section there is a steam-passage, a, which extends from the induction-opening b to the discharge-opening 0, being of zigzag form, (as represented in the drawings) for the purpose of increasing the area ofthe outer radiating surfaces, and also checking the flow of the steam, so that its heat may be more thoroughly forced through the metal; and also that the steam may be thoroughly condensed by the time it arrives at the said discharge-opening c.

' The passages a have an inclined position across the section A, so as to give an angular direction to the outer surfaces cl of the zigzags, whereby the air, in passing up through the zigzag space 2, is checked, and by being retained longer against the hot surfaces, is more thorough y heated.

. The sections are held together by means of screwbolts, B and B, which are placed respectively through the induction-openings b and the discharge-openings c, and hold in place the fittings G and O, for the conuection of the induction and-discharge-pipes.

'In the usual manner of connecting the sections of radiators, the bolts have a rigid connection at each end, and the unequal expansion of the bolts causes a twisting or warping of the sections.

The expansion of the bolts, also, frequently causes a leakage'at the section-joints, in consequence of the expansion of the section's being less than that of the bolts. I

To obviate these difficulties, I place a spring, D, under each nut E, the inner end of the spring resting against the annular plate'F, which is provided with a screw-boss, f, forthe connection of the hollow cap G, whose inner end forms a steam-joint with the plate F, there being a rubber packing-ring, g, interposedbetween them.

At the induction-end'of the radiator, the cap G is left off, to show the arrangement of the spring 1D.

The bolt B has an easy fit through the plate F, so as to allow of a free expansion and contraction of the former.

'lhe springs D are made of sufi'ieient strength to expand with requisite force to preserve steam-tight joints of the sections A, during the expansion of the bolts.

One of the caps, G, is shown in a sectional view, fi' 4.

1 do not claim broadly the formation of the steampassages of a radiator of zigzag surfaces, as such passages, with the zigzags longitudinally arranged, exist in the invention of 'l. B. Belfield, patented September 25, 1866; but

What I claim as my invention, and desire to secure I by Letters Patent, is-- l. The construction of the radiator in one or more sections, whose steam-passages are formed of inclined zigzag surfaces across the sections, substantially as set forth.

2. The combination and arrangement of. the spring D, plate F, and cap G, with the bolt B and nut E,

substantially in the manner above specified.

In testimony that the above is my invention, I ne hereunto set my hand and affixed m-y seal, this 1st day of January, 1869.

HAMPTON W. EVANS. [In 8.]

Witnesses:

STEPHEN Us'rrox, 'OHALKLEY KEMBLE. 

